Lockheed Martin is developing concepts for safe, affordable Two Stage to Orbit (TSTO) reusable launch vehicles as part of NASA s Space Launch Initiaiive. This paper discusses the options considered for the design of the TSTO, the impact of each of these options on the vehicle configuration, the criteria used for selection of preferred configurations, and the results of the selection process. More than twenty configurations were developed in detail in order to compare optioiis such as propellant... Topics: RESEARCH AIRCRAFT, HISTORIES, PROTOTYPES
The term of the second year of the award is the period from March 15, 2001 to March 14, 2002. As was the specified goal of the second year, we analyzed the spatial and spectral X-ray data for several young supernova remnants. I published a paper about an analysis of the ROSAT, ASCA, and RXTE data for the supernova remnant SN 1006. A copy of this paper is enclosed. As described in the paper, we believe that we accurately modeled the nonthermal X-ray emission from the remnant. The results of this... Topics: PROPULSION, REUSABLE LAUNCH VEHICLES, PROTOTYPES, ROCKET ENGINES
byNash-Stevenson, S. K.; Reddy, B. R.; Venkateswarlu, P
A summary is presented of the spectroscopic study of three systems: LaF3:Ho(3), LaF3:Er(3) and CaF2:Nd(3). When the D levels of Ho(3) in LaF3 were resonantly excited with a laser beam of 640 nm, upconverted emissions were detected from J (416 nm), F (485 nm), and E (546 nm) levels. Energy upconverted emissions were also observed from F and E levels of Ho(3) when the material was excited with an 800 nm near infrared laser. When the D levels of Er(3) in LaF3 were resonantly excited with a laser... Topics: SCHEDULES, SPACECRAFT CONTROL, TELEMETRY, PAYLOADS, PROTOTYPES, WORKSTATIONS
Engineers at NASA's Marshall Space Flight Center (MSFC) in Huntsville, Alabama have designed a knee brace to aid in the rehabilitation of medical patients. The device, called the Selectively Lockable Knee Brace, was designed for knee injury and stroke patients but may potentially serve in many more patient applications. Individuals with sports related injuries, spinal cord injuries and birth defects, such as spina bifida, may also benefit from the device. The Selectively Lockable Knee Brace is... Topics: BROADCASTING, PARALLEL PROCESSING (COMPUTERS), PROTOTYPES, DATA STRUCTURES, MESSAGES, TILES,...
The NASA Goddard Space Flight Center and the University of Maryland Institute for Advanced Computer Studies are studying mechanisms for installing and managing Storage Area Networks (SANs) that span multiple independent collaborating institutions using Storage Area Network Routers (SAN Routers). We present a framework for managing inter-site distributed SANs that uses Grid Technologies to balance the competing needs to control local resources, share information, delegate administrative access,... Topics: INTERFEROMETERS, METROLOGY, DEGREES OF FREEDOM, THEODOLITES, PROTOTYPES, SENSITIVITY, ROTATION,...
The International Space Station (ISS) will support several facilities dedicated to scientific research. One such facility, the Biotechnology Facility (BTF), is sponsored by the Microgravity Sciences and Applications Division (MSAD) and developed at NASA's Johnson Space Center. The BTF is scheduled for delivery to the ISS via Space Shuttle in April 2005. The purpose of the BTF is to provide: (1) the support structure and integration capabilities for the individual modules in which biotechnology... Topics: KERNEL FUNCTIONS, COMPONENT RELIABILITY, SUPERCOMPUTERS, VOIDS, PROTOTYPES, MIGRATION
This document includes a course plan for Continuous Risk Management taught by the Software Assurance Technology Center along with the Continuous Risk Management Guidebook of the Software Engineering Institute of Carnegie Mellon University and a description of Continuous Risk Management at NASA. Topics: ALGORITHMS, PROGRAM VERIFICATION (COMPUTERS), THEOREM PROVING, PROTOTYPES, DOMAINS
NASA and Lockheed-Martin approached the FSW machine vendor community with a specification for longitudinal barrel production FSW weld machines and a shorter travel process development machine in June of 2000. This specification was based on three years of FSW process development on the Space Shuttle External Tank alloys, AL2 195-T8M4 and AL22 19-T87. The primary motivations for changing the ET longitudinal welds from the existing variable polarity Plasma Arc plasma weld process included: (1)... Topics: MARS SURFACE, ROVING VEHICLES, INSTRUMENT ORIENTATION, AUTONOMY, PROTOTYPES
byJenkins, Gregory S.; Ryu, Jung-Hee; Thompson, Anne M.; Witte, Jacquelyn C
The horizontal and vertical transport of biomass fire emissions in West Africa during November 1998 through February 1999, are examined using all available data including wind, fire, aerosol, precipitation, lightning and outgoing longwave radiation. Ozonesonde data from the Aerosols99 Trans-Atlantic cruise are also included with rain and wind analyses. The results here support earlier studies that ozone and ozone precursors associated with biomass burning are confined to the lower troposphere... Topics: AUTONOMY, DECISION MAKING, INFORMATION ANALYSIS, BEHAVIOR, DECISION THEORY, PROTOTYPES
From the bitsavers.org collection, a scanned-in computer-related document.xerox :: sdd :: memos 1977 :: 19771013 October Status Report For Advanced Design And User Prototypes Group Topics: design, prototypes, prototyping, janus, ibm, specification, user, walkthrough, smalltalk, interface
byGreer, Donald; Harmory, Phil; Krake, Keith; Drela, Mar
A sailplane being developed at NASA Dryden Flight Research Center will support a high-altitude flight experiment. The experiment will measure the performance parameters or an airfoil at high altitudes (70,000 - 100,000 ft), low Reynolds numbers (2 x 10(exp 5) - 7 x 10(exp 5)), and high subsonic Mach numbers (0.5 and 0.65). The airfoil section lift and drag are determined from pilot and static pressure measurements. The locations of the separation bubble, Tollmien-Schlichting boundary-layer... Topics: AUTONOMY, SPECIFICATIONS, GROUND SUPPORT SYSTEMS, AUTOMATIC CONTROL, PROTOTYPES, SPACECRAFT CONTROL
Surfaces on the leading edge of spacecraft in low Earth orbit (e.g., surface facing the velocity direction), such as on the International Space Station, are subject to atomic oxygen attack, and certain materials are susceptible to erosion. Therefore, ground-based laboratory testing of the atomic oxygen durability of spacecraft materials is necessary for durability assessment when flight data are not available. For accurate space simulation, the facility is commonly calibrated on the basis of... Topics: ROBUSTNESS (MATHEMATICS), RUNWAYS, PRECISION, PROTOTYPES, SPACING, AIRPORTS, ROUTES
bySeaman, Nelson L.; Stauffer, David R.; Munoz, Ricardo C
The objective of this investigation was to study the role of shallow convection on the regional water cycle of the Mississippi and Little Washita Basins of the Southern Great Plains (SGP) using a 3-D mesoscale model, the PSU/NCAR MM5. The underlying premise of the project was that current modeling of regional-scale climate and moisture cycles over the continents is deficient without adequate treatment of shallow convection. At the beginning of the study, it was hypothesized that an improved... Topics: AUTOMATIC WEATHER STATIONS, OPTICAL RADAR, PROTOTYPES, DEPLOYMENT, ANTARCTIC REGIONS, AUTONOMY
The Forum was held to present the results of recent and current work intended to provide basic information required for demonstration of lean, premixed prevaporized combustors for aircraft gas turbine engine application. Papers are presented which deal with the following major topics: (1) engine interfaces; (2) fuel-air preparation; (3) autoignition; (4) lean combustion; and (5) concept design studies. Topics: CENTRIFUGES, PIEZOELECTRICITY, SHAKERS, ACTUATORS, EARTHQUAKES, PROTOTYPES, SEISMIC WAVES
bySnowden, S. L.; Freyberg, M. J.; Kuntz, K. D.; Sanders, W. T
This paper presents a catalog of shadows in the 1/4 keV soft X-ray diffuse background 4 (SXRB) that were identified by a comparison between ROSAT All-Sky Survey maps and DIRB&corrected IRAS 100 micron maps. These ''shadows'' are the negative correlations between the surface brightness of the SXRB and the column density of the Galactic interstellar medium (ISIM) over limited angular regions (a few degrees in extent). We have compiled an extensive but not exhaustive set of 378 shadows in the... Topics: SYSTEMS ENGINEERING, DATA MANAGEMENT, BIBLIOGRAPHIES, DATA BASES, PROTOTYPES, INTERNETS, SUBROUTINE...
Biomedical Optical Company of America's suntiger lenses eliminate more than 99 of harmful light wavelengths. NASA derived lenses make scenes more vivid in color and also increase the wearer's visual acuity. Distant objects, even on hazy days, appear crisp and clear; mountains seem closer, glare is greatly reduced, clouds stand out. Daytime use protects the retina from bleaching in bright light, thus improving night vision. Filtering helps prevent a variety of eye disorders, in particular... Topics: INDUSTRIES, STEELS, THERMAL CONDUCTIVITY, TECHNOLOGY UTILIZATION, THERMAL FATIGUE, EROSION,...
bydeArantesGomesEller, Rogerio; Urbina, Ligia Maria Soto; Porto, Protogenes Pire
Aircraft noise perception is related to several variables that are tangible and objective, such as the number of operations, flight schedules. Other variables, instead, are more subjective, such as preferences. However, although their elusiveness, they contribute to determine the individuals' perception of this type of externality. Despite the fact that the complaints related to aeronautical noise have been registered since the decade of 50, it has been observed that the perception of noise... Topics: AUTOMATA THEORY, SOFTWARE ENGINEERING, FORMALISM, COMPUTER PROGRAMMING, PROTOTYPES, ADAPTATION,...
A device for testing current paths is attachable to a conductor. The device automatically checks the current paths of the conductor for continuity of a center conductor, continuity of a shield, and a short circuit between the shield and the center conductor. The device includes a pair of connectors and a circuit to provide for testing of the conductive paths of a cable to be tested with the circuit paths of the circuit. The circuit paths in the circuit include indicators to simultaneously... Topics: ADAPTIVE OPTICS, TRANSMISSION, PHASED ARRAYS, SYSTEMS INTEGRATION, TELESCOPES, APERTURES, LASER...
byChoi, Sang H.; Golembiewski, Walter T.; Song, Kyo D
The concept of microwave-driven smart material actuators is envisioned as the best option to alleviate the complexity associated with hard-wired control circuitry. Networked rectenna patch array receives and converts microwave power into a DC power for an array of smart actuators. To use microwave power effectively, the concept of a power allocation and distribution (PAD) circuit is adopted for networking a rectenna/actuator patch array. The PAD circuit is imbedded into a single embodiment of... Topics: INVESTMENT CASTING, PITTING, HOUSINGS, SURFACE FINISHING, PROTOTYPES, SLURRIES, PROPULSION,...
This specification sets forth the requirements for the design, development, fabrication, quality assurance, and evaluation of the Advanced Information Processing System (AIPS) Proof-of-Concept (POC) System, hereinafter referred to as the POC System. These requirements shall be the basis for the preparation of more detailed requirements to be included in: (1) subsequent revisions of the system specification, and in related system documents, such as interface control documents (ICD's); and (2)... Topics: COMPUTER PROGRAMS, PROJECT MANAGEMENT, PROTOTYPES, SOFTWARE ENGINEERING, ANALOGIES, DATA...
The objective of this research project is to develop a portable, eye-safe, ground-based ozone lidar instrument specialized for ozone differential absorption lidar (DIAL) measurements in the troposphere. This research project directly supports the goal of NASA's Earth Science Enterprise to understand the distribution and budget of tropospheric ozone (objective 1.5 of the Earth Science Strategic Enterprise Plan, 1998-2002). It can participate in ground validation experiments for TES, a... Topics: AIR BREATHING ENGINES, X-43 VEHICLE, TECHNOLOGY UTILIZATION, FLIGHT TESTS, PROTOTYPES, SUPERSONIC...
Rotor design changes intended to improve tiltrotor whirl-flutter stability margins were analyzed. A baseline analytical model of the XV-15 was established, and then a thinner, composite wing was designed to be representative of a high-speed tiltrotor. The rotor blade design was modified to increase the stability speed margin for the thin-wing design. Small rearward offsets of the aerodynamic-center locus with respect to the blade elastic axis created large increases in the stability boundary.... Topics: NANOSATELLITES, GROUND OPERATIONAL SUPPORT SYSTEM, AUTONOMY, COMPLEX SYSTEMS, LUMINAIRES,...
byLeventis, Nicholas; Zhang, Guo-Hui; Rawashdeh, Abdel-Monem M.; Sotiriou-Leventis, Charikli
In analogy to 4-(para-substituted benzoyl)-N-methylpyridinium cations (1-X's), the title species (2-X's, -X = -OCH3, -CH3, -H, -Br, -COCH3, -NO2) undergo two reversible, well-separated (E(sub 1/2) greater than or equal to 650 mV) one-electron reductions. The effect of substitution on the reduction potentials of 2-X's is much weaker than the effect of the same substituents on 1-X's: the Hammett rho-values are 0.80 and 0.93 for the 1st- and 2nd-e reduction of 2-X's vs. 2.3 and 3.3 for the same... Topics: ARCHITECTURE (COMPUTERS), PARALLEL COMPUTERS, INTERFACES, RELIABILITY ANALYSIS, COMPUTER...
Blackglas(Trademark) polysiloxane systems produce silicon oxycarbide glasses by pyrolysis in inert atmosphere. The silicon oxycarbides evidence oxidative degradation that limits their lifetime as composite matrices. The present study characterizes bonding rearrangements in the oxycarbide network accompanying increases in pyrolysis temperature. It also addresses the changes in susceptibility to oxidation due to variations in the distribution of Si bonded species obtained under different... Topics: AMPLIFIER DESIGN, OPERATIONAL AMPLIFIERS, TRANSDUCERS, SIGNAL PROCESSING, PRODUCT DEVELOPMENT,...
Passive microwave satellite observations have frequently been used to observe changes in sea ice cover and concentration. Comiso et al. showed that there may also be a direct relationship between the thickness of snow cover (h(sub s)) on ice and microwave emissivity at 90 GHz. Because the in situ experiment of experiment of Comiso et al. was limited to a single station, the relationship is re-examined in this paper in a more general context and using more extensive in situ microwave... Topics: SCIENTIFIC VISUALIZATION, COMPUTER PROGRAMS, DATA ACQUISITION, FRAMES (DATA PROCESSING), COMPUTER...
This document is a viewgraph presentation which reviews the role of the space architect in designing a space vehicle with habitability as a chief concern. Habitability is composed of the qualities of the environment or system which support the crew in working and living. All the impacts from habitability are interdependent; i.e., impacts to well-being can impact performance, safety or efficiency. After reviewing the issues relating to habitability the presentation discusses the application of... Topics: AUTOMATIC CONTROL, FAILURE, FALSE ALARMS, TRAJECTORIES, AIRSPACE, ERRORS, MONTE CARLO METHOD,...
byShin, Yoonghyun; Calise, Anthony J.; Motter, Mark A
This paper summarizes the application of two adaptive approaches to autopilot design, and presents an evaluation and comparison of the two approaches in simulation for an unmanned aerial vehicle. One approach employs two-stage dynamic inversion and the other employs feedback dynamic inversions based on a command augmentation system. Both are augmented with neural network based adaptive elements. The approaches permit adaptation to both parametric uncertainty and unmodeled dynamics, and... Topics: PROPULSION SYSTEM CONFIGURATIONS, OXYGEN, TECHNOLOGY ASSESSMENT, PREBURNERS, PROTOTYPES, TURBINE...
byJenkins, Luther N.; Khorrami, Mehdi R.; Choudhari, Meelan M.; McGinley, Catherine B
A joint computational and experimental study has been performed at NASA Langley Research Center to investigate the unsteady flow generated by the components of an aircraft landing gear system. Because the flow field surrounding a full landing gear is so complex, the study was conducted on a simplified geometry consisting of two cylinders in tandem arrangement to isolate and characterize the pertinent flow phenomena. This paper focuses on the experimental effort where surface pressures, 2-D... Topics: TECHNOLOGY UTILIZATION, VOLTAGE CONVERTERS (DC TO DC), CRYOGENICS, PROTOTYPES, EFFICIENCY, NASA...
The efforts of this report concentrate on the design, development and application of massively parallel model based, image processing algorithms to deconvolve, reconstruct, or enhance degraded imagery. Algorithms have been developed to deconvolve the optical response function from a noisy or corrupted image or set of images. The algorithms have been applied to Hubble Space Telescope (HST) Faint Object Camera (FOC) imagery, to the Solar and Heliospheric Observatory (SOHO) Large Angle... Topics: MANUFACTURING, PROTOCOL (COMPUTERS), ROCKET TEST FACILITIES, TEST STANDS, SENSORS, AUTONOMY,...
Nickel-base superalloys are the current choice for high-temperature jet engine applications such as turbine blades and vanes. However, after more than five decades of use, nickel-base superalloys have reached their limit, since the operating temperatures in gas turbine engines are now approaching the melting temperature of these alloys. Thus alternative materials, such as lightweight NiAl intermetallic alloys with superior properties, (e.g., high melting temperature, high thermal conductivity,... Topics: SPACECRAFT ELECTRONIC EQUIPMENT, CODERS, SATELLITE COMMUNICATION, COMMUNICATION EQUIPMENT, PULSE...
An experimental study of the effects of an ingested vortex on the flowfield of a diffusing S-duct is reported. The vortex is generated through the use of a stationary pinwheel device mounted upstream of the diffusing S-duct. Three test conditions vary the location of the vortex in the duct inlet crossplane. For each condition of ingested vortex, a baseline S-duct and an S-duct with an array of vortex generators is examined. The data taken consist of duct inlet and exit crossplane surveys of... Topics: CONVULSIONS, LOW COST, MORTALITY, PROTOTYPES, DISABILITIES, EPILEPSY, MEASURING INSTRUMENTS,...
Histoire entre science fiction et thriller utilisant un format de narration à mi-chemin entre le livre audio et la saga mp3, appelé "Livre immersif". Topics: livre audio, audio, livre, adrien mangold, mangold, prototypeS, science fiction, thriller, mp3,...
bySmith, Howard A.; Gutermuth, R., et al; Allen, L.; Megeath, T.; Barmby, P.; Calvet, N.; Fazio, G.; Hartmann, L.; Myers, P.; Marengo, M.
The Infrared Array Camera (IRAC) onboard Spitzer has imaged regions of star formation (SF) in its four IR bands with spatial resolutions of approximately 2''/pixel. IRAC is sensitive enough to detect very faint, embedded young stars at levels of tens of Jy, and IRAC photometry can categorize their stages of development: from young protostars with infalling envelopes (Class 0/1) to stars whose infrared excesses derive from accreting circumstellar disks (Class 11) to evolved stars dominated by... Topics: SITUATIONAL AWARENESS, AIRCRAFT INSTRUMENTS, DISPLAY DEVICES, HELICOPTERS, EXPERT SYSTEMS, AIRCRAFT...
This report documents efforts to survey the current research directions in sensor technology for gas turbine systems. The work is driven by the current and future requirements on system performance and optimization. Accurate real time measurements of velocities, pressure, temperatures, and species concentrations will be required for objectives such as combustion instability attenuation, pollutant reduction, engine health management, exhaust profile control via active control, etc. Changing... Topics: COMPOSITE STRUCTURES, TURBINE BLADES, JET ENGINES, FAILURE, PROTOTYPES, LOADS (FORCES), MANDRELS,...
Design features and performance characteristics of thermionic reactor systems for space applications Topics: CONFIGURATION MANAGEMENT, CONSOLES, DISPLAY DEVICES, EQUIPMENT SPECIFICATIONS, PROTOTYPES,...
We propose a flexible security authentication solution for the spacecraft end-user, which will allow the user to interact over Internet with the spacecraft, its instruments, or with the ground segment from anywhere, anytime based on the user's pre-defined set of privileges. This package includes biometrics authentication products, such as face, voice or fingerprint recognition, authentication services and procedures, such as: user registration and verification over the Internet and user... Topics: PROTOTYPES, ARCHITECTURE (COMPUTERS), SIMULATORS, SIMULATION, INTERFACES, TECHNOLOGY ASSESSMENT,...
byHilburger, Mark W.; Nemeth, Michael P.; Starnes, James H., Jr
The results of an analytical study of the nonlinear and buckling response characteristics of curved panels subjected to combined loads are presented. Aluminum and laminated composite panels are considered in the study and a flat and shallow curved panel configurations are considered as well. The panels are subjected to combined axial compression and transverse tension or compression loads or combined axial compression and inplane shear loads. Results illustrating the effects of various combined... Topics: CONTAMINANTS, PROTOTYPES, TRANSMITTANCE, OXYGEN ATOMS, COMPUTERIZED SIMULATION, SURFACE REACTIONS,...